Standardising Assessment of Superficial Pyoderma in Dogs: Proposal of a Severity Score.

Objective lesion quantification provides reliable severity assessment for canine superficial pyoderma without subjective categorical grading.

This prospective study addresses the lack of validated severity scoring systems for superficial pyoderma in dogs by developing an objective assessment tool. Sixty client-owned dogs with characteristic lesions (papules, pustules, epidermal collarettes, crusts) were evaluated by six clinicians across baseline and follow-up visits. The study demonstrated that subjective categorical severity assessments and lesion type recognition showed poor inter-clinician agreement. However, objective lesion quantification—counting individual papules and pustules while measuring confluent lesions, collarettes, and crusts—demonstrated good reliability. Clinician-assigned numerical severity scores also showed good inter-clinician reliability. The researchers developed a predictive mathematical model combining lesion quantification data that estimates pyoderma severity on a 0-100 scale, with a mean absolute error of nine points. This objective approach eliminates reliance on subjective categorical grading, providing a standardized method for assessing superficial pyoderma severity. While requiring further validation, this scoring system offers veterinary dermatologists a reproducible, quantitative framework for evaluating disease progression and treatment efficacy in canine pyoderma cases.

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